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 <head>
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  <meta name="Generator" content="EditPlus®">
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  <title>一列宽度自适应布局</title>
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    #layout{
        background-color:#cccccc;
        border:2px solid #333333;
        width:80%;
        height:300px;
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<div id="layout">一列宽度自适应布局</div>
 </body>
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